Nice find! If you are on Facebook, you might check out a group in Yorkshire, UK that uses a Near-Infrared camera mounted to a drone, then imaging algorithms to find similar features. The group is called Yorkshire Archaeological Aerial Mapping. The author of the posts is really descriptive about their finds and is really good about answering questions. I am not sure if the group is on any other social media.

https://www.facebook.com/yaamapping/